aPrivate cars were forbidden on the road and public vehicles were free from 9 a.m. to 7a.m. during the car-free activity in Brussels. 私人汽车在路禁止了,并且公众车是从上午9点解脱。 对7a.m。 在无汽车活动期间在布鲁塞尔。 [translate] aGoodbye without reasons is the most painful one. ...
The preparation method of the noise reduction felt for the automobile comprises the following steps of: firstly opening and mixing with artificial fiber yarns, regenerated cotton fiber yarns and broken foam particles directly as raw materials; and carrying out steps of vacuum absorption preforming, ...
there is no expected reduction of sound intensity, which naturally dissipates with the distance from the observer. WithH2/dB=0.3, it is already expected there will be a reduction in noise intensity provided by the barrier of around 5dB, which increases as the observer moves away. In the case...
9 RegisterLog in Sign up with one click: Facebook Twitter Google Share on Facebook noise pollution Thesaurus Medical Financial Encyclopedia Wikipedia Related to noise pollution:water pollution,air pollution noise pollution n. Environmental noise that is annoying, distracting, or physically harmful. Also...
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Apart from reducing car noises, mufflers also contribute to the overall performance of the exhaust system by helping to control back pressure. They are designed to strike a balance between noise reduction and maintaining an appropriate level of back pressure. ...
GM cars introduced in 1984.[7] It was also used in factory car stereos in Jeep vehicles in the 1980s, such as theCherokee XJ. Today, DNR, DNL, and similar systems are most commonly encountered as a noise reduction system in microphone systems.[8] [edit]Other approaches A second ...
efficient air fleet management that result in lower requirements for helicopters to position or reposition in Kadugli, the reduction [...] daccess-ods.un.org 这 些节省额来自在整个期间在喀土穆和奥贝德提供内部自办的更具成本效益的地 面装运服务,而不是外包给商业供应商;在维护和修理直升机停机坪...
It should be noted that decibel is a unit for sound intensity in the logarithmic scale. This means that a 3 dB reduction corresponds to halving the sound intensity, whereas 10 dB reduction corresponds to 90% of reduction in the sound intensity. Therefore, the figure implies that the noise in...
Simultaneously, microphones measure sound in the cabin and ensure a precise noise reduction signal is generated. Speakers Speakers within the cabin close the signal loop and the offending sound wave is reduced. The result is a quieter internal zone around each passenger and an audibly more comfort...